| 摘要 |
PURPOSE:To avoid cavitation effectively, by controlling the operation of a centrifugal pump through measuring the vibration level of a pump casing, and detecting the initial generation of cavitation according to said measured vibration level. CONSTITUTION:Electric current output from a vibration accelerometer 12 is increased when cavitation is generated initially, and this electric current is given to a comparison circuit 16 after the noize of this electric current is eliminated in a filter circuit 14. In said circuit 16, the electric current is compared with the logarithmic vibration level at the initial generation of cavitation, and a signal for avoidance of cavitation is sent from the comparison circuit 16 to a pump control circuit 17, if said compared result is over the standard value. In this way, cavitation of the pump can be avoided automatically.
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